Half to george



IiNrrnD STATES PATENT Erica.

SIMEON LATHAM GOULD, OF GARDINER, MAINE, ASSIGNOR OF ONE- HALF TO GEORGEIV. RUSSELL, OF LAVRENCE, MASS.

COMPOUND PULP-BEATI'NG ENGINE.

SPECIFICATION forming part of Letters Patent No. 310,940, dated January20, 1885. Application filed September ifi, 1884. (No model.)

o all whom/ ib may concern:

Be itknown that I, SIMEONLATHAM GoULD, a citizen'of the United States,residing at Gardiner, in the county of Kennebec and State of Maine, haveinvented certain new and useful Improvements in Compound Pulp-BeatingEngines; and I do hereby declare the following to be avfull,clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to let-ters or figurescenter, thence passed to the circumi'erence ot" the heads by centrifugalforce, whence, by pressure, it gravitates toward the center of a chamberformed upon the back side of each head, which is active only upon oneside. By this arrangement there is but little if any tendency for thepulp to be thrown from 'the center on the back side, where it collectsand passes through an oritice to the center and active side of the nexthead, and so f f f on successively until it has been properly reducedand emerges in a suitable 'state ready to be supplied to thepaper-making machine.

This invention further consists in arranging said rolls at differentdegrees ot' distance from their stationary beds, and accordinglyproviding them with dierent styles of knives, so that stock orhalf-stock may be furnished and gradually reduced and entirely'iinishedin one single continuous operation.

The drawings accompanying this specitica tion represent, in Figure 1, avertical central longitudinal section of apulp-engine embodying myimprovements. Fig. 2is a transverse section on li-ne x x of Fig. l, andFig. 3 is an end elevation showing the means for operating the slidingbox. Fig. 4 represents means of connecting two or more engines on asingle line of shafting and means for adjusting the distance of therolls from their stationary beds.

In these drawings, A represents a closed case, which receives ahorizontal revolving shaft, B, located centrally thereof, suitable 5 5packing devices being supplied at either end to prevent escape of pulpexcept through the inlet and outlet pipes C and D. This case is providedwith a series of annular recesses or chambers, E E El, &c., arranged atright an- 6o gies to the axis ofthe shaft, and formed by the partitionsF F F Upon the shaft B are securely mounted, at suitable distancesapa-rt,

a series of circular heads, a a a", provided upon their front or activesides with radial cutting bars or knives b b b, Sac., these knivescooperating with removable circular bedplates c c ci, disposed in 011eside of the chambers, and furnished with bars, as is usual in sucheases.

I do not wish to contine myself to the precise construction of thecuttersand theirbedplates, as they may be made of` any suitable abradingmaterialsuch as emery or sandstone-and equally good results be obtained.75 The back side ofthe heads and the corresponding opposite faces d ddi, Src., of the partitions F F Fl are always to be some distance apart,to form chambers e e'ez with smooth sides, `while the several recesses,E E' E, are

connected one with the other by central holes,

Hitherto in engines of this class the rotary head has been armed on bothsides, and the chamber in which it revolves similarly so; hence there isa strong centrifugal force generated by the action of the knives intheir ro tation, which tends to maintain the pulp away from the center,where it is most desired, and it is to overcome these objections that Ihave armed the rotary head only upon one side.

My 4system is essentially as follows: The material to be ground is fedunder pressure centrally tothe active or armed side of the first head inthe series, which is so arranged with respect to its co -operatingstationary bed-plate that the stock shall be operated upon properly withrespect to the fiber between the two surfaces, whence by the action ofthe cutting-surfaces and centrifugal force generx00 ated by theirrotation, together with the head of the water and pulp, it passes to theoutside of the head around its circumference, aided byobliquely-arranged peripheral fins, into the smooth-sided chamber uponthe rear side of the head. Here the centrifugal force is reduced to aminimum, and gravity, aided by the pressure upon the pulp from the frontside, tends to crowd it toward the center-and maintain the chamber lled.I propose to aid the pulp somewhat in its course toward the centralfeeding orifices, ff f2, by securing to the back sides of the headstheir curved plates Ylt 7.', eccentrically disposed, with their rearends nearer to the shaft than their iront ends, that the rotation of theheads will tend to draw and crowd the pulp toward the center. Thecentral bore or orifice leading from this chamber again conducts thepulp centrally to the active portion of the second head in the series,when a second grinding or reduction process ensues, the pulp movingoutwardly and thence passing into the chamber in the rear. This processmay be successively repeated as many times as is required tosufficiently reduce the material.

The arrows in the drawings represent the course of the pulp from chamberto chamber. This compound engine is especially adapted for brushing out,so called, wood pulp where the fiber of the material is alreadysuficiently reduced but a shive remains. In this case the rotating headswould all have the same position with respect to their stationarybed-plates, and the shives which escaped one head would certainly bereduced by some one of the following series of heads. In case harderstock was to be supplied, the first disks and their bed-plates would befurnished with cutters corresponding to the work to be accomplished, andthe succeeding ones would be further :modified until, perhaps, the lastwould be simply for brushing the pulp so reduced. y

In Fig. 3 I have shown the end of the shaft B, journaled in anadjustable boX,-G, sliding in ways g g', cut in a suitable supportingstand H, the interior of this box being provided with a series ofannular slots, h h, and ribs i i, to engage similar ones formed upon theperiphery of the shaft. This arrangement is to effect adjustment of theheads a a a2 properly with respect to the stationary bedplates c c c2,since it is evident that movement of the box G must effect, by theinterlocking of the parts hh and te', similar motion of the shaft, andby means of the handscrews jj against the stand said box and shaft areadjusted to any desired degree.

To unite a pair of these compound engines upon a single line ofshafting, I have shown, in Fig. 5, end portions of twol shafts, B B,connected by an ordinary spline-and-groove coupling. At each end of thecoupling I have secured two nuts, I I, and cut a suitable distance uponthe shaft a peripheral screw-thread, upon which the nuts move.

The action of the coupling compels rotation of the shafts in unison,while longitudinal movement can easily be effected by changing thepositions of the nuts I I', each of which adjusts its own 'shaft andconsequent change inthe distance or place between the rotary heads andtheir bed-plates. This arrangement overcomes the end friction and wearconsequent when the two shafts are each separately stepped, since theend-thrust -and friction is borne by the nuts against the coupling,which revolves with the shaft, and the usual resultant friction iseliminated.

I claiml. In an engine for reducing paper pulp, the combination, with ahopper constructed as described, with its stationary bed platesy of aseries of rotary heads so adapted and ar- 85 ranged individually as tosuccessively partially reduce the pulp which is passed to thecircumference thereof, and then returned on the rear side to be `fedcentrally to the next adjacent head in the series, substantially as andfor purposes stated.

2. In apaper-pulp engine, the series of centrally-fed rotary headsprovided with a front or active and a rear or inactive side, the latteras a means toreturn the pulp centrally to the active side of the ne'xtadjacent head successively throughout the series, substantially asstated.

' 3. A paper-pulp-reducing engine composed o f a case having two or morebed-plates and two or more rotary heads, each co operating with its ownbed-plate, substantially as described.

4. A case provided with two or more chambers connected together byopenings f f at or near their centers, and two or more bedplates,combined with two or more rotary heads and a shaft to move them, one ofthe said bed-plates and rotary heads being in each of the said chambers,substantially as described.

5. A case provided with two or more connected chambers and two or morebed-plates, one in each chamber, combined with two or more rotary headsprovided with cutters ef 115 different size, to gradually andsuccessively act upon and reduce the paper-pulp passing between them andthe heads, substantially as described.

6. A case provided with an inlet for the paper-pulp stock, to maintainthe same in a column above the top of the case, and having two or moreconnected chambers and an outlet, combined with two or more bed-platesand two or more rotary heads, to operate sub- 1 25 stantially asdescribed, the length of the column in the inlet pipe aiding inmaintaining thc circulation of the pulp through the case.

7. The case and its connected chambers, and the bed-plates, onein eachchamber, com- 13o IOO IIO

bined with two or more rotary heads provided with cutters at their,ysides next the bed-plates, and with curved plates k k at theiroppositefaces, substantially as described.

8. The case having two or more connected chamLers, and a bed-plate ineach chamber,

combined with the shaft and its attached'rotary plates, 'each platebeing arranged with its face near the bedplate, the backf of the platebeing at a greater distance from the wall of the case to forma spacethrough which the pulp may readily pass on its way to the next chamber,as set forth.

9. In a paper-pnlp-reducing engine, a easehaving a series of connectedchambers, and a series of bed-plates open at their centers, combinedwith a rotary shaft and a series of bedplates, this shaft being extendedthrough the open centers ot' the bedplates, substantially as desoribedlIn testimony whereof I aftix my signature in presence of two witnesses.

' SIMEON LATHAM GOULD.

Witnesses:

H. E. LODGE, A. F. HAYDEN.

